CN113466286B - Freeze-thaw test equipment for simulating concrete ultralow-temperature-large-temperature-difference freeze-thaw process - Google Patents
Freeze-thaw test equipment for simulating concrete ultralow-temperature-large-temperature-difference freeze-thaw process Download PDFInfo
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- CN113466286B CN113466286B CN202110731701.2A CN202110731701A CN113466286B CN 113466286 B CN113466286 B CN 113466286B CN 202110731701 A CN202110731701 A CN 202110731701A CN 113466286 B CN113466286 B CN 113466286B
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Abstract
The application provides a freeze-thaw test equipment for simulating a concrete ultralow temperature-large temperature difference freeze-thaw process, and relates to the technical field of freeze-thaw tests. The freezing and thawing test equipment for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process comprises a test cabin, a refrigeration compressor and a nitrogen supply device. The test chamber is used for placing a target part for freeze-thaw testing, and the refrigeration compressor is configured to reduce the temperature in the test chamber. The nitrogen supply is configured to supply liquid nitrogen into the test chamber to reduce the temperature within the test chamber. The freeze-thaw test equipment for simulating the concrete ultralow-temperature-large-temperature-difference freeze-thaw process is provided with two cooling devices, namely a refrigeration compressor and a nitrogen supply device, wherein the refrigeration compressor and the nitrogen supply device have different cooling capacities and can simulate different environmental temperatures so that the simulated environment is closer to the actual engineering environment of a target part, and the accuracy of the thermal performance test of the target part is improved.
Description
Technical Field
The application relates to the technical field of freeze-thaw tests, in particular to a freeze-thaw test device for simulating a concrete ultralow temperature-large temperature difference freeze-thaw process.
Background
At present, concrete is an artificial building material with a great amount of consumption at present, and is widely used in engineering structures under various environments, and is gradually applied to extreme environments such as ultralow temperature, for example, as a concrete storage tank for liquefied natural gas, the temperature of the liquefied natural gas is generally-165 ℃, when the liquefied natural gas is stored in the concrete storage tank, the temperature born by the concrete storage tank is about-165 ℃, and when the liquefied natural gas is purified in the concrete storage tank, the liquefied natural gas is filled in the concrete storage tank, and the liquefied natural gas leaks, the concrete storage outer tank will experience ultralow temperature-large temperature difference freeze thawing and strong pressure change. The impact of this particular environment on the thermal performance of concrete is directly related to the safe storage of lng.
However, the existing testing equipment for the thermal performance of the concrete storage tank is difficult to simulate the extreme environment, which causes that at present, only a few research conclusions about the evolution characteristics of the thermal performance of concrete in the ultralow temperature environment have large differences. Therefore, designing a test device capable of simulating an extreme environment becomes an urgent problem to be solved in the field of concrete thermal performance research.
Disclosure of Invention
The embodiment of the application provides a freeze-thaw test equipment for simulating a concrete ultralow temperature-large temperature difference freeze-thaw process so as to improve the accuracy of concrete thermal performance test.
The embodiment of the application provides a freeze-thaw test equipment for simulating a concrete ultralow temperature-large temperature difference freeze-thaw process, which comprises a test cabin, a refrigeration compressor and a nitrogen supply device. The test chamber is used for placing a target part for freeze-thaw testing, and the refrigeration compressor is configured to reduce the temperature in the test chamber. The nitrogen supply is configured to provide liquid nitrogen into the test chamber to reduce the temperature within the test chamber.
Among the above-mentioned technical scheme, the freeze-thaw test equipment of simulation concrete ultra-low temperature-big difference in temperature freeze thawing process is provided with two kinds of heat sink of compressor and confession nitrogen device, and compressor and confession nitrogen device cooling capacity are different, can simulate different ambient temperature to make the environment of simulation more be close to the actual engineering environment of target spare, thereby improve the accuracy of target spare thermal behavior test. When the environment temperature needing to be simulated is higher, the refrigerating compressor can be used for cooling the test chamber, and when the environment temperature needing to be simulated is lower, the nitrogen supply device can be used for supplying liquid nitrogen to the test chamber so as to reduce the temperature in the test chamber. Certainly also can be that refrigerant compressor and nitrogen supply device cooperate and cool down in the test chamber, earlier through refrigerant compressor with the temperature in the test chamber drop to first threshold value, the rethread supplies nitrogen device to provide the liquid nitrogen in order to reduce the temperature in the test chamber to the temperature that needs, can practice thrift the liquid nitrogen like this in the test chamber.
In some embodiments of the present application, the freeze-thaw testing apparatus that simulates the ultra-low temperature-large temperature difference freeze-thaw process of concrete further comprises a heating device configured to elevate a temperature within the test compartment.
Among the above-mentioned technical scheme, because compressor and confession nitrogen device all are used for cooling down in the test chamber, heating device can adjust the temperature in the test chamber after compressor and/or confession nitrogen device excessively cool down the test chamber.
In some embodiments of the present application, the heating device includes a heat pipe in communication with the interior of the test chamber and a heat supply assembly for providing heat, the heat supply assembly being disposed outside the test chamber and in communication with the heat pipe.
Among the above-mentioned technical scheme, set up heating element outside the test chamber, can avoid test chamber internal environment condition to change the heating performance who influences heating element and shorten heating element's life.
In some embodiments of the present application, the freeze-thaw testing apparatus for simulating the ultra-low temperature-large temperature difference freeze-thaw process of concrete further comprises a rotating device, the rotating device is disposed at the bottom of the test chamber, and the rotating device is configured to drive the test chamber to rotate.
Among the above-mentioned technical scheme, the freeze thawing test equipment of simulation concrete ultra-low temperature-big difference in temperature freeze thawing process still includes rotary device, and rotary device is used for driving the test cabin to rotate, can make liquid nitrogen etc. more even in the distribution of test cabin, improves the temperature distribution homogeneity in the test cabin.
In some embodiments of the present application, the freeze-thaw testing apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises an image acquisition device configured to acquire an image of the target part.
Among the above-mentioned technical scheme, image acquisition device can carry out image acquisition to the target part in the test cabin to thermal behavior analysis to the target part provides image data.
In some embodiments of the present application, the test chamber is a transparent structure, and the image acquisition device is arranged on the periphery of the test chamber.
Among the above-mentioned technical scheme, image acquisition device sets up in the periphery of experimental cabin, can avoid experimental cabin internal environment condition to change the performance that influences with image acquisition device and shorten image acquisition device's life.
In some embodiments of the present application, the freeze-thaw test equipment that simulates the ultra-low temperature-large temperature difference freeze-thaw process of concrete further comprises an illumination light source.
Among the above-mentioned technical scheme, the illumination light source can make the illumination effect around the experimental cabin better, can make the image information that image acquisition device gathered more clear.
In some embodiments of the present application, the freeze-thaw test apparatus that simulates a concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a pressure regulating device configured to regulate a pressure within the test chamber.
Among the above-mentioned technical scheme, pressure adjusting device can adjust the pressure in the test cabin to simulate different pressure environment, with the mechanical properties of test target spare under different pressure environment.
In some embodiments of the present application, the freeze-thaw test equipment for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a first discharging device, the first discharging device is communicated with the inside of the test chamber, and the first discharging device is configured to discharge the fluid medium in the test chamber when the temperature reducing device reduces the temperature of the test chamber.
Among the above-mentioned technical scheme, first heat abstractor can guarantee the pressure balance stability in the test chamber when compressor cools down to the test chamber.
In some embodiments of the application, the first discharge device comprises a first discharge duct communicating the test compartment with the return air unit, and the return air unit is configured to introduce the fluid medium discharged from the first discharge duct from the test compartment into the refrigeration compressor.
Among the above-mentioned technical scheme, the return air unit can be with leading-in refrigerant compressor cyclic utilization of the fluid medium that discharges from first discharge tube in the test chamber.
In some embodiments of the present application, the freeze-thaw testing apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a second discharging device, the second discharging device is communicated with the inside of the box body, and the second discharging device is configured to discharge the fluid medium in the test chamber when the nitrogen supplying device cools the test chamber.
Among the above-mentioned technical scheme, the second discharging equipment can guarantee that the pressure balance in the test chamber is stable when supplying the nitrogen device to cool down the test chamber.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a freeze-thaw testing system provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a freeze-thaw test apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the connection between the liquid nitrogen gasification device and the experiment chamber provided by the embodiment of the application;
fig. 4 is a schematic structural view of the pressure regulating device.
Icon: 100-freeze-thaw test system; 10-a box body; 11-a first opening; 12-a box cover; 121-a first viewing window; 20-a freeze-thaw test device for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process; 21-a test chamber; 211-a second opening; 212-an air inlet; 213-an air outlet; 214-mounting holes; 214-a temperature sensor; 22-a refrigeration compressor; 23-a nitrogen supply means; 231-a nitrogen storage tank; 232-nitrogen supply pipe; 233-liquid nitrogen gasification device; 2331-liquid nitrogen disperser; 2332-liquid nitrogen stirrer; 2333-protective covers; 2334-a drive member; 24-blast pipes; 25-a first switching device; 26-a first discharge device; 261-a first drain pipe; 262-return air unit; 27-a second discharge device; 271-a second discharge pipe; 28-a second switching device; 29-a heating device; 291-heat conducting pipe; 292-a heating assembly; 230-a pressure regulating device; 2301-a control room; 23011-a second viewing window; 2303-pressure conduction tube; 2304-a suction switch; 2305-pressure gauge; 2306-vacuum pump; 240-a rotation device; 2401-rotating disk; 2402-a driver; 250-an image acquisition device; 260-an illumination source; 270-a circuit protection device; 2701-switching power supply ground protection; 2702-power leakage protection device; 2703-control room overtemperature protection device; 2704-carry protection means; 280-a control panel; 2801-USB data sockets; 2802-programmable logic controller; 2803-human-computer interaction interface; 2804-power source general control switch; 2805-power indicator light; 2806-control circuit indicator light; 2807-automatic control switch; 2808-manual control switch; 290-power source.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is conventionally understood by those skilled in the art, is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Examples
With the rapid increase of global liquefied natural gas energy demand, the construction of liquefied natural gas receiving stations is increasing. The outer tank of the liquefied natural gas storage tank is made of reinforced concrete, when liquefied natural gas is stored in the concrete storage tank, the storage temperature in the storage tank is about-165 ℃, and the outer wall of the storage tank is in contact with the ambient environment. When natural gas purification, fill to fill even the inner tank reveals, concrete storage jar will experience big difference in temperature freeze thawing effect, and simultaneously, the concrete storage jar is located the pressure environment and will also take place violent change. This kind of complex action direct influence concrete structure's stability leads to the local degradation of concrete storage jar to destroy, causes the jar interior liquefied natural gas to reveal even to cause the storage jar accident, cause serious casualties and loss of property.
However, a test system for testing the thermal performance of the concrete in a complex environment is not available at present, the performance test of the concrete against the action of ultralow temperature-large temperature difference under the conditions of multiple freeze-thaw paths and pressure cannot be realized, the test environment is inconsistent with the actual engineering, and the engineering design and construction cannot be directly guided.
Based on this, this application embodiment provides a technical scheme, can simulate the actual engineering environment that concrete storage tank was located to improve the accuracy of concrete thermal performance test.
As shown in fig. 1 to fig. 3, the freeze-thaw test system 100 provided by the embodiment of the present application includes a box 10 and a freeze-thaw test device 20 for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process, where the freeze-thaw test device 20 for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process is accommodated in the box 10, and the box 10 can protect the freeze-thaw test device 20 for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process.
As shown in fig. 1, the freeze-thaw test system 100 further includes a box cover 12, the box cover 12 is used for opening or closing the first opening 11, wherein the box cover 12 opens or closes the first opening 11 by a first hydraulic cylinder driving rod (not shown), one end of the first hydraulic driving rod is hinged to a side of the box cover 12 facing the box 10, and the other end of the first hydraulic driving rod is hinged inside the box 10. The first hydraulic drive rod stretches out and draws back and can realize that case lid 12 opens or closes first opening 11, and when first hydraulic drive rod extended, first opening 11 can be opened to case lid 12, and when first hydraulic drive rod shortened, first opening 11 can be closed to case lid 12.
In other embodiments, the opening or closing of the first opening 11 by the cover 12 can be achieved in other ways.
The cover 12 is further provided with a first observation window 121 for observing the inside of the case 10. The first observation window 121 may be a transparent glass observation window with a vacuum interlayer in the middle.
As shown in fig. 2, in the present embodiment, the freezing and thawing test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process includes a test chamber 21, a refrigeration compressor 22 and a nitrogen supply device 23. The refrigeration compressor 22 is configured to reduce the temperature within the test compartment 21. The refrigerant compressor 22 increases the refrigerant from a low pressure to a high pressure in a vapor compression refrigeration system and circulates the refrigerant continuously, thereby allowing the system to continuously discharge internal heat to an environment higher than the temperature of the system.
The freezing and thawing test equipment 20 for simulating the concrete ultralow-temperature and large-temperature-difference freezing and thawing process is provided with two cooling devices, namely a refrigeration compressor 22 and a nitrogen supply device 23, wherein the refrigeration compressor 22 and the nitrogen supply device 23 have different cooling capacities and can simulate different environmental temperatures so that the simulated environment is closer to the actual engineering environment of a target part, and the accuracy of the thermal performance test of the target part is improved. When the environment temperature to be simulated is higher, the refrigerating compressor 22 can be used for cooling the inside of the test chamber 21, and when the environment temperature to be simulated is lower, liquid nitrogen can be supplied into the test chamber 21 through the nitrogen supply device 23 to reduce the temperature in the test chamber 21. Certainly, the refrigeration compressor 22 and the nitrogen supply device 23 can be matched to cool the test chamber 21, the temperature in the test chamber 21 is reduced to a first threshold value through the refrigeration compressor 22, and then liquid nitrogen is supplied into the test chamber 21 through the nitrogen supply device 23 to reduce the temperature in the test chamber 21 to a required temperature, so that the liquid nitrogen can be saved.
The test chamber 21 is used for placing a target member to be subjected to a freeze-thaw test. The target part differs from test to test, and in this embodiment, the target part is a concrete storage tank. In other embodiments, the target may be a member formed of other materials.
The test chamber 21 is provided with a second opening 211 for placing a target part, the freeze-thaw test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a sealing hatch cover (not shown in the figure), the sealing hatch cover is used for opening or closing the second opening 211, the opening or closing of the second opening 211 by the sealing hatch cover is realized by a second hydraulic cylinder driving rod (not shown in the figure), one end of the second hydraulic driving rod is hinged with one side of the sealing hatch cover facing the box body 10, and the other end of the second hydraulic driving rod is hinged inside the test chamber 21. The flexible sealed hatch that can realize of second hydraulic drive pole opens or closes first opening 11, and when the extension of second hydraulic drive pole, the second opening 211 can be opened to the sealed hatch, and when the second hydraulic drive pole shortened, the second opening 211 can be closed to the sealed hatch.
In this embodiment, the test chamber 21 is a transparent structure, and the chamber wall of the test chamber 21 may be a structure having a vacuum interlayer, and the vacuum interlayer has a heat insulation effect, so that the test chamber 21 has a good heat insulation effect. On the one hand, reduces heat exchange between the inside and the outside of the test chamber 21, and on the other hand, facilitates the acquisition of an image of the apparent form of the object through the wall of the test chamber 21.
In this embodiment, an air inlet 212 is provided at one side of the upper end of the test chamber 21, the nitrogen supply device 23 includes a nitrogen storage tank 231 and a nitrogen supply pipe 232, and the air inlet 212 is communicated with the air supply pipe 24 through the nitrogen supply pipe 232.
The nitrogen supply pipe 232 may be an adiabatic pipe, and the nitrogen supply pipe 232 serves to communicate the nitrogen storage tank 231 with the gas inlet 212. The air inlet 212 is provided at the upper end of the test chamber 21 so that the liquid nitrogen can fall into the test chamber 21 from top to bottom and be distributed in the test chamber 21 as uniformly as possible to improve the uniformity of temperature distribution in the test chamber 21.
As shown in fig. 3, the nitrogen supply device 23 further includes a liquid nitrogen gasifying device 233, the liquid nitrogen gasifying device 233 includes a liquid nitrogen disperser 2331 and a liquid nitrogen stirrer 2332, the liquid nitrogen disperser 2331 is located in the test chamber 21 and is communicated with the nitrogen supply pipe 232 through the air inlet 212, the liquid nitrogen disperser 2331 is a pipe with a plurality of small holes in the peripheral wall, and the liquid nitrogen in the nitrogen storage tank 231 enters the liquid nitrogen disperser 2331 through the nitrogen supply pipe 232 and the air inlet 212 and is discharged into the test chamber 21 through the small holes in the peripheral wall of the liquid nitrogen disperser 2331. The liquid nitrogen stirrer 2332 comprises a stirring fan (not shown), a protective cover 2333 covering the periphery of the stirring fan, and a driving member 2334, the liquid nitrogen disperser 2331 is wound around the periphery of the protective cover 2333, the driving member 2334 is positioned outside the test chamber 21 and in the box 10, and the peripheral wall of the test chamber 21 is provided with a mounting hole 214 through which an output shaft of the driving member 2334 extends into the test chamber 21 and is connected with the stirring fan; the driving member 2334 is used for driving the stirring fan to rotate, the stirring fan rotates to change the airflow in the test chamber 21, the liquid nitrogen discharged from the small holes in the peripheral wall of the liquid nitrogen disperser 2331 can contact with fan blades of the stirring fan at least through the holes in the protective cover 2333, the gasification of the liquid nitrogen can be accelerated under the change of the airflow and the direct action of the fan blades of the stirring fan, and the liquid nitrogen can be rapidly and uniformly distributed in the test chamber 21. The drive 2334 can be a motor. The small holes of the liquid nitrogen disperser 233 are evenly distributed at intervals in the extending direction of the liquid nitrogen disperser 233.
The refrigeration compressor 22 communicates with the air inlet 212 through the blast pipe 24, and the refrigeration compressor 22 sends cold air into the test chamber 21 through the blast pipe 24 to reduce the temperature in the test chamber 21.
The freeze-thaw test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a first switching device 25, wherein the first switching device 25 is used for enabling the nitrogen supply pipe 232 to be communicated with the air inlet 212 or enabling the air supply pipe 24 to be communicated with the air inlet 212. When first switching device 25 communicates nitrogen supply pipe 232 with air inlet 212, nitrogen is supplied from the nitrogen supply tank into test chamber 21 through the air supply pipe and air inlet 212, so as to lower the temperature in test chamber 21. When the first switching device 25 causes the air supply duct 24 to communicate with the air inlet 212, the refrigeration compressor 22 supplies cold air into the test chamber 21 through the air supply duct 24 and the air inlet 212 to reduce the temperature in the test chamber 21.
The first switching device 25 may be a solenoid valve.
The lower end of the test chamber 21 is further provided with an air outlet 213, and the air inlet 212 and the air outlet 213 are distributed on two radial sides of the test chamber 21.
In the present embodiment, the freezing and thawing test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process further includes a first discharging device 26, the first discharging device 26 is communicated with the inside of the test chamber 21, and the first discharging device 26 is configured to discharge the fluid medium in the test chamber 21 when the temperature reducing device reduces the temperature of the test chamber 21. The first discharging device 26 can ensure that the pressure in the test chamber 21 is balanced and stable when the refrigeration compressor 22 cools the test chamber 21.
Wherein the first discharge device 26 comprises a first discharge duct 261 and a return air unit 262, the first discharge duct 261 communicating with the air outlet 213, the first discharge duct communicating the test compartment 21 with the return air unit 262, the return air unit 262 being configured to conduct the fluid medium discharged from the first discharge duct of the test compartment 21 to the refrigeration compressor 22. The return air unit 262 can introduce the fluid medium discharged from the first discharge pipe 261 in the test chamber 21 to the refrigeration compressor 22 for recycling.
The freezing and thawing test device 20 for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process further comprises a second discharging device 27, the second discharging device 27 is communicated with the interior of the box body 10, and the second discharging device 27 is configured to discharge the fluid medium in the test chamber 21 when the nitrogen supply device 23 cools the test chamber 21. The second discharging device 27 can ensure that the pressure in the test chamber 21 is balanced and stable when the nitrogen supply device 23 cools the test chamber 21.
Wherein the second discharge device 27 includes a second discharge pipe 271, and the second discharge pipe 271 communicates with the air outlet 213.
In this embodiment, the freeze-thaw testing apparatus 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further includes a second switching device 28, and the second switching device 28 is used for communicating the first discharge pipe 261 with the air outlet 213 or communicating the second discharge pipe 271 with the air outlet 213. The second switching device 28 may be a solenoid valve.
When the temperature in test chamber 21 needs to be reduced by refrigeration compressor 22, first switching device 25 enables air supply pipe 24 to be communicated with air inlet 212 and nitrogen supply pipe 232 to be disconnected with air inlet 212, and second switching device 28 enables first discharge pipe 261 to be communicated with air outlet 213 and second discharge pipe 271 to be disconnected with air outlet 213.
When the temperature in test chamber 21 needs to be reduced by nitrogen supply device 23, first switching device 25 disconnects air supply pipe 24 from air inlet 212 and communicates nitrogen supply pipe 232 with air inlet 212, and second switching device 28 disconnects first discharge pipe 261 from air outlet 213 and communicates second discharge pipe 271 with air outlet 213.
The first switching device 25 and the second switching device 28 are controlled to act through the temperature control mode self-adjusting circuit, so that the automatic switching of two temperature control modes of temperature control through the nitrogen supply device 23 and temperature control through the refrigeration compressor 22 is realized, and the ultra-low temperature-large temperature difference freeze-thaw test of the concrete within the range of +30 to-190 ℃ is met.
In this embodiment, a plurality of temperature sensors 214 are disposed at different positions inside the test chamber 21, and are used for monitoring the temperature distribution inside the test chamber 21 and determining whether the temperature distribution inside the test chamber 21 is uniform in real time.
In this embodiment, the freeze-thaw test apparatus 20 for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process further includes a heating device 29, and the heating device 29 is configured to raise the temperature inside the test chamber 21. The heating device 29 can adjust the temperature in the test chamber 21 after the refrigeration compressor 22 and/or the nitrogen supply device 23 excessively cools the test chamber 21, for example, the refrigeration compressor 22 or the nitrogen supply device 23 cools the test chamber 21 to-190 ℃, the engineering environment temperature actually required to be simulated is-160 ℃, and since the refrigeration compressor 22 and the nitrogen supply device 23 are both used for cooling the test chamber 21, the temperature in the test chamber 21 can be heated and increased by the heating device 29 so that the temperature in the test chamber 21 is increased from-190 ℃ to-160 ℃.
The heating device 29 includes a heat pipe 291 communicating with the inside of the test chamber 21 and a heating component 292 for providing heat, and the heating component is disposed outside the test chamber 21 and communicates with the heat pipe 291. By disposing the heating assembly 292 outside the test chamber 21, it is possible to prevent the change of the internal environmental conditions of the test chamber 21 from affecting the heating performance of the heating assembly 292 and to shorten the service life of the heating assembly 292.
Whether heating device 29 works can go on according to the temperature that temperature sensor 214 detected, according to the inside temperature of the experimental cabin 21 that temperature sensor 214 monitoring obtained, compare with the target temperature who sets for, the inside temperature of the experimental cabin 21 that obtains when temperature sensor 214 monitoring is less than the target temperature, then control heating device 29 heats experimental cabin 21, if the inside temperature of the experimental cabin 21 that temperature sensor 214 monitoring obtained is higher than the target temperature, heating device 29 is out of work, and cool down to the target temperature through compressor 22 and/or confession nitrogen device 23 to experimental cabin 21. Meanwhile, when the temperature of the test chamber 21 reaches a positive temperature (higher than 0 ℃), the heating device 29 will start to assist the refrigeration compressor 22 to perform precise temperature control.
In the present embodiment, the freezing and thawing test device 20 for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process further comprises a rotating device 240, the rotating device 240 is disposed at the bottom of the test chamber 21, and the rotating device 240 is configured to drive the test chamber 21 to rotate. The rotating device 240 is used for driving the test chamber 21 to rotate, so that liquid nitrogen and the like can be distributed more uniformly in the test chamber 21, and the temperature distribution uniformity in the test chamber 21 is improved.
The rotating device 240 comprises a driving member 2402 and a rotating disc 2401, the test chamber 21 is provided with the rotating disc 2401, and the driving member 2402 is used for driving the rotating disc to rotate around the axis of the driving member. Drive 2402 may be an electric motor. According to the parameter setting, after the driving motor is started, the test chamber 21 rotates according to the set rotation mode. The rotation of the test chamber 21 can reduce the unevenness of the temperature inside the test chamber 21 to some extent.
The freeze-thaw testing apparatus 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises an image acquisition device 250, wherein the image acquisition device 250 is configured to acquire an image of the target piece. The image acquisition device 250 is capable of acquiring images of the target part within the test chamber 21 to provide image data for thermal performance analysis of the target part.
When the rotating device 240 drives the test chamber 21 to rotate, the image acquisition device 250 can also acquire images at different positions on the circumference of the test chamber 21, so that the image acquisition device 250 acquires view angle images of the target piece.
Because the bulkhead of the test chamber 21 is a transparent structure, and the image acquisition device 250 is arranged on the periphery of the test chamber 21, the influence of the change of the internal environmental conditions of the test chamber 21 on the performance of the image acquisition device 250 can be avoided, and the service life of the image acquisition device 250 can be shortened.
In the present embodiment, the freezing and thawing test device 20 for simulating the concrete ultra-low temperature-large temperature difference freezing and thawing process comprises a plurality of image acquisition devices 250, wherein the plurality of image acquisition devices 250 are arranged at intervals along the periphery of the test chamber 21. The image capture device 250 may be a camera.
The freeze-thaw test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises an illumination light source 260. The illumination light source 260 can make the illumination effect around the test chamber 21 better, and can make the image information collected by the image collecting device 250 clearer.
As shown in fig. 4, the freeze-thaw testing apparatus 20 for simulating the ultra-low temperature-large temperature difference freeze-thaw process of concrete further comprises a pressure adjusting device 230, wherein the pressure adjusting device 230 is configured to adjust the pressure in the test chamber 21 to simulate different pressure environments so as to test the mechanical properties of the target piece under different pressure environments.
The pressure adjusting device 230 includes a control chamber 2301, a sealing cover (not shown), a pressure conduction tube 2303, an air suction switch 2304, a pressure gauge 2305 and a vacuum pump 2306. The sealing cover is used to close or open the opening of the conditioning chamber 2301.
Regulation and control room 2301 is located experimental cabin 21, and pressure gauge 2305 that just is located experimental cabin 21 outside in pressure conduction pipe 2303's one end and the box 10 is connected, and the other end communicates with regulation and control room 2301 is inside, passes to pressure gauge 2305 through pressure conduction pipe 2303 with the pressure value in regulating and control room 2301.
In order to facilitate observation of the apparent state of the sample, the wall surface of the control chamber 2301 is provided with a second observation window 23011 and dynamic collection of an image of the sample in the pressure control chamber 2301.
Referring to fig. 1, in order to ensure the safety of the freeze-thaw testing system 100, the freeze-thaw testing system 100 further includes a circuit protection device 270.
The circuit protection device 270 is located in the box 10, and the circuit protection device 270 includes a switching power supply ground protection device 2701, a power supply leakage protection device 2702, a control room over-temperature protection device 2703 and an overload protection device 2704.
The liquid nitrogen rapid gasification device and the circuit protection device 270 jointly form a circuit, temperature and liquid nitrogen three-dimensional safety protection system, and the safety and reliability of the test system can be ensured.
The freeze-thaw test system 100 further comprises a control panel 280, wherein the control panel 280 comprises a USB data socket 2801, a programmable logic controller 2802, a human-computer interface 2803, a power master control switch 2804, a power indicator 2805, a control circuit indicator 2806, an automatic control switch 2807, and a manual control switch 2808.
The USB data socket 2801 is used to facilitate downloading of data obtained from the test chamber 21 by a user. The human-machine interface 2804 is used to monitor and adjust the pressure conditions (e.g., monitor the pressure conditions in the control room 2301, adjust the target pressure value in the test chamber 21, and maintain the target pressure value for a certain period of time), and control the temperature (e.g., maintain the temperature in the test chamber 21 for a certain period of time). The programmable logic controller 2802 is intercommunicated with the automatic control switch 2807 according to the setting of the human-computer interface 2804, so that the programmable logic controller 2802 sends a command to the automatic control switch to actuate the corresponding component, for example, when the temperature in the test chamber 21 set by the human-computer interface 2804 is 160 ℃, the programmable logic controller 2802 sends a command to the refrigeration compressor 22 and/or the nitrogen supply device 223, and the refrigeration compressor 22 and/or the nitrogen supply device 223 work to cool the inside of the test chamber 21 until the temperature in the test chamber 21 reaches the temperature set by the human-computer interface 2804. The control circuit indicator 2806 indicates the current off and on status of the automatic control switch 2807. If the manual control switch 2808 is on, the automatic control function is turned off, and the temperature, pressure, and the like need to be adjusted manually, and if the manual control switch 2808 is off, the automatic control function is turned on, and the temperature, pressure, and the like do not need to be adjusted manually, or the number of parts to be adjusted manually is reduced.
The freeze-thaw test system 100 further comprises a power supply 290, the power supply 290 is used for supplying power to all structures needing power in the freeze-thaw test equipment 20 for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process, and the power supply 290 is arranged in the box body 10.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A freeze-thaw test equipment for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process is characterized by comprising:
the test cabin is used for placing a target piece for freeze thawing test;
a refrigeration compressor configured to reduce a temperature within the test compartment; and
a nitrogen supply device configured to supply liquid nitrogen into the test chamber to reduce the temperature in the test chamber;
the freezing and thawing test equipment for simulating the concrete ultralow-temperature-large-temperature-difference freezing and thawing process further comprises a first discharging device, a second discharging device, a first switching device and a second switching device, wherein the first discharging device is communicated with the interior of the test chamber, the first discharging device is configured to discharge fluid media in the test chamber when the test chamber is cooled by the refrigeration compressor, the first discharging device comprises a first discharging pipe and a return air unit, the first discharging pipe is used for communicating the test chamber with the return air unit, and the return air unit is configured to guide the fluid media discharged from the first discharging pipe of the test chamber into the refrigeration compressor; the second discharging device is communicated with the interior of the test cabin and is configured to discharge fluid media in the test cabin when the nitrogen supply device cools the test cabin;
the first switching device is used for enabling a nitrogen supply pipe of the nitrogen supply device to be communicated with the air inlet or enabling an air supply pipe of the refrigeration compressor to be communicated with the air inlet, and the second switching device is used for enabling the first discharge pipe to be communicated with the air outlet or enabling a second discharge pipe of the second discharge device to be communicated with the air outlet;
the second switching device is used for communicating the first discharge pipe with the air outlet or communicating the second discharge pipe with the air outlet;
the freeze-thaw test equipment for simulating the concrete ultra-low temperature-large temperature difference freeze-thaw process further comprises a heating device configured to raise the temperature in the test chamber.
2. The freeze-thaw test equipment for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 1, wherein the heating device comprises a heat pipe communicated with the inside of the test chamber and a heat supply component for supplying heat, the heat supply component is arranged outside the test chamber and communicated with the heat pipe.
3. The freeze-thaw test equipment for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 1, further comprising a rotating device disposed at the bottom of the test chamber, wherein the rotating device is configured to drive the test chamber to rotate.
4. The freeze-thaw test apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 3, further comprising an image acquisition device configured to perform image acquisition on the target piece.
5. The freeze-thaw test equipment for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 4, wherein the test chamber is a transparent structure, and the image acquisition device is arranged at the periphery of the test chamber.
6. The freeze-thaw test apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 1, further comprising an illumination light source.
7. The freeze-thaw test apparatus for simulating a concrete ultra-low temperature-large temperature difference freeze-thaw process according to claim 1, further comprising a pressure adjusting device configured to adjust a pressure inside the test chamber.
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| CN113984808B (en) * | 2021-10-28 | 2023-07-21 | 中国科学院西北生态环境资源研究院 | Test method for expanding rock fracture by freezing method |
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